package com.fjwt.gz.coupon.lkls.lklspayutil;

import com.alibaba.fastjson2.JSON;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;

/**
 * @author Post Method
 */
public class HttpRequest {

    /**
     * 向指定URL发送POST请求
     * 
     * @param url
     * @param paramMap
     * @return
     * @return 响应结果
     */
    public static String sendPost(String url, Map<String, String> paramMap) throws IOException {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
            conn.setRequestProperty("Charset", "UTF-8");
            conn.setRequestProperty("content-type", "application/json");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());

            // 设置请求属性
            String param = JSON.toJSONString(paramMap);
//            if (paramMap != null && paramMap.size() > 0) {
//                Iterator<String> ite = paramMap.keySet().iterator();
//                while (ite.hasNext()) {
//                    String key = ite.next();// key
//                    String value = paramMap.get(key);
//                    param += key + "=" + value + "&";
//                }
//                param = param.substring(0, param.length() - 1);
//            }

            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

}
